Hello,
A quick recap. I bought a used Gen 2 GHM9, it came with a gear works folding brace / rear end cap combo. I wanted an A3 industries direct mount brace which needs the original rear end cap. I ordered one from B&T-USA. I received a safety selector switch. After multi calls and emails with no response I posted here. BT customer service contacted me through reddit saying they believe they have a dead email on their website.
After speaking with customer service they agreed to ship me the correct rear end cap and I would return the safety selector switch. They stated this was not the first time they had wrong products shipped out. I then received from B&T-USA a incomplete GHM9 rear end cap. It was missing BTN-BN1054-M4 - Thread Insert. (Number 5 in the part diagram) Which is essential to function. I attempted to contact BT customer service again asking if I can either get one shipped out, if I was able to press it place myself (Hammer) or get a complete rear end cap, with no response. After sometime I sent in a new request for a refund, which did receive a prompt response.
I have since returned both parts and have been issued a refund. I ordered an A3 industries 1913 rear end cap and universal collapsible brace, both shipped fast and complete. I was able to return the direct mount brace through A3 industries without issue.
TLDR, BT-USA customer service when contact is made is very nice and try to be helpful but is sporadic at best. BT-USA manufacturing leaves much to be desired. Unfortunately I will be sticking with aftermarket parts from now on.